define(function(require, exports, module) {
  var $ = Zepto;

  /**
   * @ver 1.1.0
   * @via https://github.com/aralejs/qrcode/blob/master/src/qrcode.js
   * @license http://aralejs.org/
   */

  var qrcodeAlgObjCache = [];

  /**
   * 二维码构造函数，主要用于绘制
   * @param  {参数列表} opt 传递参数
   * @return {}
   */
  var qrcode = function(opt) {
    if (typeof opt === 'string') { // 只编码ASCII字符串
      opt = {
        text: opt
      };
    }
    //设置默认参数
    this.options = $.extend({}, {
      text: "",
      render: "",
      width: 256,
      height: 256,
      correctLevel: 3,
      background: "#ffffff",
      foreground: "#000000"
    }, opt);

    //使用QRCodeAlg创建二维码结构
    var qrCodeAlg = null;
    for (var i = 0, l = qrcodeAlgObjCache.length; i < l; i++) {
      if (qrcodeAlgObjCache[i].text == this.options.text && qrcodeAlgObjCache[i].text.correctLevel == this.options.correctLevel) {
        qrCodeAlg = qrcodeAlgObjCache[i].obj;
        break;
      }
    }
    if (i == l) {
      qrCodeAlg = new QRCodeAlg(this.options.text, this.options.correctLevel);
      qrcodeAlgObjCache.push({text: this.options.text, correctLevel: this.options.correctLevel, obj: qrCodeAlg});
    }

    if (this.options.render) {
      switch (this.options.render) {
        case "canvas":
          return this.createCanvas(qrCodeAlg);
        case "table":
          return this.createTable(qrCodeAlg);
        case "svg":
          return this.createSVG(qrCodeAlg);
        default:
          return this.createDefault(qrCodeAlg);
      }
    }
    return this.createDefault(qrCodeAlg);
  };
  /**
   * 使用Canvas来画二维码
   * @return {}
   */

  qrcode.prototype.createDefault = function(qrCodeAlg) {
    var canvas = document.createElement('canvas');
    if (canvas.getContext)
      return this.createCanvas(qrCodeAlg);
    if (!!document.createElementNS && !!document.createElementNS(SVG_NS, 'svg').createSVGRect)
      return this.createSVG(qrCodeAlg);
    return this.createTable(qrCodeAlg);
  };
  qrcode.prototype.createCanvas = function(qrCodeAlg) {
    //创建canvas节点
    var canvas = document.createElement('canvas');
    canvas.width = this.options.width;
    canvas.height = this.options.height;
    var ctx = canvas.getContext('2d');

    //计算每个点的长宽
    var tileW = (this.options.width / qrCodeAlg.getModuleCount()).toPrecision(4);
    var tileH = this.options.height / qrCodeAlg.getModuleCount().toPrecision(4);

    //绘制
    for (var row = 0; row < qrCodeAlg.getModuleCount(); row++) {
      for (var col = 0; col < qrCodeAlg.getModuleCount(); col++) {
        ctx.fillStyle = qrCodeAlg.modules[row][ col] ? this.options.foreground : this.options.background;
        var w = (Math.ceil((col + 1) * tileW) - Math.floor(col * tileW));
        var h = (Math.ceil((row + 1) * tileW) - Math.floor(row * tileW));
        ctx.fillRect(Math.round(col * tileW), Math.round(row * tileH), w, h);
      }
    }
    //返回绘制的节点
    return canvas;
  };
  /**
   * 使用table来绘制二维码
   * @return {}
   */
  qrcode.prototype.createTable = function(qrCodeAlg) {
    //创建table节点
    var s = [];
    s.push('<table style="border:0px; margin:0px; padding:0px; border-collapse:collapse; background-color: ' +
        this.options.background +
        ';">');
    // 计算每个节点的长宽；取整，防止点之间出现分离
    var tileW = -1, tileH = -1, caculateW = -1, caculateH = -1;
    tileW = caculateW = Math.floor(this.options.width / qrCodeAlg.getModuleCount());
    tileH = caculateH = Math.floor(this.options.height / qrCodeAlg.getModuleCount());
    if (caculateW <= 0) {
      if (qrCodeAlg.getModuleCount() < 80) {
        tileW = 2;
      } else {
        tileW = 1;
      }
    }
    if (caculateH <= 0) {
      if (qrCodeAlg.getModuleCount() < 80) {
        tileH = 2;
      } else {
        tileH = 1;
      }
    }

    // 绘制二维码
    foreTd = '<td style="border:0px; margin:0px; padding:0px; width:' + tileW + 'px; background-color: ' + this.options.foreground + '"></td>',
        backTd = '<td style="border:0px; margin:0px; padding:0px; width:' + tileW + 'px; background-color: ' + this.options.background + '"></td>',
        l = qrCodeAlg.getModuleCount();

    for (var row = 0; row < l; row++) {
      s.push('<tr style="border:0px; margin:0px; padding:0px; height: ' + tileH + 'px">');
      for (var col = 0; col < l; col++) {
        s.push(qrCodeAlg.modules[row][col] ? foreTd : backTd);
      }
      s.push('</tr>');
    }
    s.push('</table>');
    var span = document.createElement("span");
    span.innerHTML = s.join('');

    return span.firstChild;
  };

  /**
   * 使用SVG开绘制二维码
   * @return {}
   */
  qrcode.prototype.createSVG = function(qrCodeAlg) {
    var x, dx, y, dy,
        moduleCount = qrCodeAlg.getModuleCount(),
        scale = this.options.height / this.options.width,
        svg = '<svg xmlns="http://www.w3.org/2000/svg" '
            + 'width="' + this.options.width + 'px" height="' + this.options.height + 'px" '
            + 'viewbox="0 0 ' + moduleCount * 10 + ' ' + moduleCount * 10 * scale + '">',
        rectHead = '<path ',
        foreRect = ' style="stroke-width:0.5;stroke:' + this.options.foreground
            + ';fill:' + this.options.foreground + ';"></path>',
        backRect = ' style="stroke-width:0.5;stroke:' + this.options.background
            + ';fill:' + this.options.background + ';"></path>';

    // draw in the svg
    for (var row = 0; row < moduleCount; row++) {
      for (var col = 0; col < moduleCount; col++) {
        x = col * 10;
        y = row * 10 * scale;
        dx = (col + 1) * 10;
        dy = (row + 1) * 10 * scale;

        svg += rectHead + 'd="M ' + x + ',' + y
            + ' L ' + dx + ',' + y
            + ' L ' + dx + ',' + dy
            + ' L ' + x + ',' + dy
            + ' Z"';

        svg += qrCodeAlg.modules[row][ col] ? foreRect : backRect;
      }
    }

    svg += '</svg>';

    // return just built svg
    return $(svg)[0];
  };

  module.exports = qrcode;

  /**
   * 获取单个字符的utf8编码
   * unicode BMP平面约65535个字符
   * @param {num} code
   * return {array}
   */
  function unicodeFormat8(code) {
    // 1 byte
    if (code < 128) {
      return [code];
      // 2 bytes
    } else if (code < 2048) {
      c0 = 192 + (code >> 6);
      c1 = 128 + (code & 63);
      return [c0, c1];
      // 3 bytes
    } else {
      c0 = 224 + (code >> 12);
      c1 = 128 + (code >> 6 & 63);
      c2 = 128 + (code & 63);
      return [c0, c1, c2];
    }
  }

  /**
   * 获取字符串的utf8编码字节串
   * @param {string} string
   * @return {array}
   */
  function getUTF8Bytes(string) {
    var utf8codes = [];
    for (var i = 0; i < string.length; i++) {
      var code = string.charCodeAt(i);
      var utf8 = unicodeFormat8(code);
      for (var j = 0; j < utf8.length; j++) {
        utf8codes.push(utf8[j]);
      }
    }
    return utf8codes;
  }

  /**
   * 二维码算法实现
   * @param {string} data              要编码的信息字符串
   * @param {num} errorCorrectLevel 纠错等级
   */
  function QRCodeAlg(data, errorCorrectLevel) {
    this.typeNumber = -1; //版本
    this.errorCorrectLevel = errorCorrectLevel;
    this.modules = null;  //二维矩阵，存放最终结果
    this.moduleCount = 0; //矩阵大小
    this.dataCache = null; //数据缓存
    this.rsBlocks = null; //版本数据信息
    this.totalDataCount = -1; //可使用的数据量
    this.data = data;
    this.utf8bytes = getUTF8Bytes(data);
    this.make();
  }

  QRCodeAlg.prototype = {
    constructor: QRCodeAlg,
    /**
     * 获取二维码矩阵大小
     * @return {num} 矩阵大小
     */
    getModuleCount: function() {
      return this.moduleCount;
    },
    /**
     * 编码
     */
    make: function() {
      this.getRightType();
      this.dataCache = this.createData();
      this.createQrcode();
    },
    /**
     * 设置二位矩阵功能图形
     * @param  {bool} test 表示是否在寻找最好掩膜阶段
     * @param  {num} maskPattern 掩膜的版本
     */
    makeImpl: function(maskPattern) {

      this.moduleCount = this.typeNumber * 4 + 17;
      this.modules = new Array(this.moduleCount);

      for (var row = 0; row < this.moduleCount; row++) {

        this.modules[row] = new Array(this.moduleCount);

      }
      this.setupPositionProbePattern(0, 0);
      this.setupPositionProbePattern(this.moduleCount - 7, 0);
      this.setupPositionProbePattern(0, this.moduleCount - 7);
      this.setupPositionAdjustPattern();
      this.setupTimingPattern();
      this.setupTypeInfo(true, maskPattern);

      if (this.typeNumber >= 7) {
        this.setupTypeNumber(true);
      }
      this.mapData(this.dataCache, maskPattern);
    },
    /**
     * 设置二维码的位置探测图形
     * @param  {num} row 探测图形的中心横坐标
     * @param  {num} col 探测图形的中心纵坐标
     */
    setupPositionProbePattern: function(row, col) {

      for (var r = -1; r <= 7; r++) {

        if (row + r <= -1 || this.moduleCount <= row + r) continue;

        for (var c = -1; c <= 7; c++) {

          if (col + c <= -1 || this.moduleCount <= col + c) continue;

          if ((0 <= r && r <= 6 && (c == 0 || c == 6)) || (0 <= c && c <= 6 && (r == 0 || r == 6)) || (2 <= r && r <= 4 && 2 <= c && c <= 4)) {
            this.modules[row + r][col + c] = true;
          } else {
            this.modules[row + r][col + c] = false;
          }
        }
      }
    },
    /**
     * 创建二维码
     * @return {[type]} [description]
     */
    createQrcode: function() {

      var minLostPoint = 0;
      var pattern = 0;
      var bestModules = null;

      for (var i = 0; i < 8; i++) {

        this.makeImpl(i);

        var lostPoint = QRUtil.getLostPoint(this);
        if (i == 0 || minLostPoint > lostPoint) {
          minLostPoint = lostPoint;
          pattern = i;
          bestModules = this.modules;
        }
      }
      this.modules = bestModules;
      this.setupTypeInfo(false, pattern);

      if (this.typeNumber >= 7) {
        this.setupTypeNumber(false);
      }

    },
    /**
     * 设置定位图形
     * @return {[type]} [description]
     */
    setupTimingPattern: function() {

      for (var r = 8; r < this.moduleCount - 8; r++) {
        if (this.modules[r][6] != null) {
          continue;
        }
        this.modules[r][6] = (r % 2 == 0);

        if (this.modules[6][r] != null) {
          continue;
        }
        this.modules[6][r] = (r % 2 == 0);
      }
    },
    /**
     * 设置矫正图形
     * @return {[type]} [description]
     */
    setupPositionAdjustPattern: function() {

      var pos = QRUtil.getPatternPosition(this.typeNumber);

      for (var i = 0; i < pos.length; i++) {

        for (var j = 0; j < pos.length; j++) {

          var row = pos[i];
          var col = pos[j];

          if (this.modules[row][col] != null) {
            continue;
          }

          for (var r = -2; r <= 2; r++) {

            for (var c = -2; c <= 2; c++) {

              if (r == -2 || r == 2 || c == -2 || c == 2 || (r == 0 && c == 0)) {
                this.modules[row + r][col + c] = true;
              } else {
                this.modules[row + r][col + c] = false;
              }
            }
          }
        }
      }
    },
    /**
     * 设置版本信息（7以上版本才有）
     * @param  {bool} test 是否处于判断最佳掩膜阶段
     * @return {[type]}      [description]
     */
    setupTypeNumber: function(test) {

      var bits = QRUtil.getBCHTypeNumber(this.typeNumber);

      for (var i = 0; i < 18; i++) {
        var mod = (!test && ((bits >> i) & 1) == 1);
        this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;
        this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
      }
    },
    /**
     * 设置格式信息（纠错等级和掩膜版本）
     * @param  {bool} test
     * @param  {num} maskPattern 掩膜版本
     * @return {}
     */
    setupTypeInfo: function(test, maskPattern) {

      var data = (QRErrorCorrectLevel[this.errorCorrectLevel] << 3) | maskPattern;
      var bits = QRUtil.getBCHTypeInfo(data);

      // vertical
      for (var i = 0; i < 15; i++) {

        var mod = (!test && ((bits >> i) & 1) == 1);

        if (i < 6) {
          this.modules[i][8] = mod;
        } else if (i < 8) {
          this.modules[i + 1][8] = mod;
        } else {
          this.modules[this.moduleCount - 15 + i][8] = mod;
        }

        // horizontal
        var mod = (!test && ((bits >> i) & 1) == 1);

        if (i < 8) {
          this.modules[8][this.moduleCount - i - 1] = mod;
        } else if (i < 9) {
          this.modules[8][15 - i - 1 + 1] = mod;
        } else {
          this.modules[8][15 - i - 1] = mod;
        }
      }

      // fixed module
      this.modules[this.moduleCount - 8][8] = (!test);

    },
    /**
     * 数据编码
     * @return {[type]} [description]
     */
    createData: function() {
      var buffer = new QRBitBuffer();
      var lengthBits = this.typeNumber > 9 ? 16 : 8;
      buffer.put(4, 4); //添加模式
      buffer.put(this.utf8bytes.length, lengthBits);
      for (var i = 0, l = this.utf8bytes.length; i < l; i++) {
        buffer.put(this.utf8bytes[i], 8);
      }
      if (buffer.length + 4 <= this.totalDataCount * 8) {
        buffer.put(0, 4);
      }

      // padding
      while (buffer.length % 8 != 0) {
        buffer.putBit(false);
      }

      // padding
      while (true) {

        if (buffer.length >= this.totalDataCount * 8) {
          break;
        }
        buffer.put(QRCodeAlg.PAD0, 8);

        if (buffer.length >= this.totalDataCount * 8) {
          break;
        }
        buffer.put(QRCodeAlg.PAD1, 8);
      }
      return this.createBytes(buffer);
    },
    /**
     * 纠错码编码
     * @param  {buffer} buffer 数据编码
     * @return {[type]}
     */
    createBytes: function(buffer) {

      var offset = 0;

      var maxDcCount = 0;
      var maxEcCount = 0;

      var length = this.rsBlock.length / 3;

      var rsBlocks = new Array();

      for (var i = 0; i < length; i++) {

        var count = this.rsBlock[i * 3 + 0];
        var totalCount = this.rsBlock[i * 3 + 1];
        var dataCount = this.rsBlock[i * 3 + 2];

        for (var j = 0; j < count; j++) {
          rsBlocks.push([dataCount, totalCount]);
        }
      }

      var dcdata = new Array(rsBlocks.length);
      var ecdata = new Array(rsBlocks.length);

      for (var r = 0; r < rsBlocks.length; r++) {

        var dcCount = rsBlocks[r][0];
        var ecCount = rsBlocks[r][1] - dcCount;

        maxDcCount = Math.max(maxDcCount, dcCount);
        maxEcCount = Math.max(maxEcCount, ecCount);

        dcdata[r] = new Array(dcCount);

        for (var i = 0; i < dcdata[r].length; i++) {
          dcdata[r][i] = 0xff & buffer.buffer[i + offset];
        }
        offset += dcCount;

        var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
        var rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1);

        var modPoly = rawPoly.mod(rsPoly);
        ecdata[r] = new Array(rsPoly.getLength() - 1);
        for (var i = 0; i < ecdata[r].length; i++) {
          var modIndex = i + modPoly.getLength() - ecdata[r].length;
          ecdata[r][i] = (modIndex >= 0) ? modPoly.get(modIndex) : 0;
        }
      }

      var data = new Array(this.totalDataCount);
      var index = 0;

      for (var i = 0; i < maxDcCount; i++) {
        for (var r = 0; r < rsBlocks.length; r++) {
          if (i < dcdata[r].length) {
            data[index++] = dcdata[r][i];
          }
        }
      }

      for (var i = 0; i < maxEcCount; i++) {
        for (var r = 0; r < rsBlocks.length; r++) {
          if (i < ecdata[r].length) {
            data[index++] = ecdata[r][i];
          }
        }
      }

      return data;

    },
    /**
     * 布置模块，构建最终信息
     * @param  {} data
     * @param  {} maskPattern
     * @return {}
     */
    mapData: function(data, maskPattern) {

      var inc = -1;
      var row = this.moduleCount - 1;
      var bitIndex = 7;
      var byteIndex = 0;

      for (var col = this.moduleCount - 1; col > 0; col -= 2) {

        if (col == 6) col--;

        while (true) {

          for (var c = 0; c < 2; c++) {

            if (this.modules[row][col - c] == null) {

              var dark = false;

              if (byteIndex < data.length) {
                dark = (((data[byteIndex] >>> bitIndex) & 1) == 1);
              }

              var mask = QRUtil.getMask(maskPattern, row, col - c);

              if (mask) {
                dark = !dark;
              }

              this.modules[row][col - c] = dark;
              bitIndex--;

              if (bitIndex == -1) {
                byteIndex++;
                bitIndex = 7;
              }
            }
          }

          row += inc;

          if (row < 0 || this.moduleCount <= row) {
            row -= inc;
            inc = -inc;
            break;
          }
        }
      }
    }

  };
  /**
   * 填充字段
   */
  QRCodeAlg.PAD0 = 0xEC;
  QRCodeAlg.PAD1 = 0x11;


//---------------------------------------------------------------------
// 纠错等级对应的编码
//---------------------------------------------------------------------

  var QRErrorCorrectLevel = [1, 0, 3, 2];

//---------------------------------------------------------------------
// 掩膜版本
//---------------------------------------------------------------------

  var QRMaskPattern = {
    PATTERN000: 0,
    PATTERN001: 1,
    PATTERN010: 2,
    PATTERN011: 3,
    PATTERN100: 4,
    PATTERN101: 5,
    PATTERN110: 6,
    PATTERN111: 7
  };

//---------------------------------------------------------------------
// 工具类
//---------------------------------------------------------------------

  var QRUtil = {

    /*
     每个版本矫正图形的位置
     */
    PATTERN_POSITION_TABLE: [
      [],
      [6, 18],
      [6, 22],
      [6, 26],
      [6, 30],
      [6, 34],
      [6, 22, 38],
      [6, 24, 42],
      [6, 26, 46],
      [6, 28, 50],
      [6, 30, 54],
      [6, 32, 58],
      [6, 34, 62],
      [6, 26, 46, 66],
      [6, 26, 48, 70],
      [6, 26, 50, 74],
      [6, 30, 54, 78],
      [6, 30, 56, 82],
      [6, 30, 58, 86],
      [6, 34, 62, 90],
      [6, 28, 50, 72, 94],
      [6, 26, 50, 74, 98],
      [6, 30, 54, 78, 102],
      [6, 28, 54, 80, 106],
      [6, 32, 58, 84, 110],
      [6, 30, 58, 86, 114],
      [6, 34, 62, 90, 118],
      [6, 26, 50, 74, 98, 122],
      [6, 30, 54, 78, 102, 126],
      [6, 26, 52, 78, 104, 130],
      [6, 30, 56, 82, 108, 134],
      [6, 34, 60, 86, 112, 138],
      [6, 30, 58, 86, 114, 142],
      [6, 34, 62, 90, 118, 146],
      [6, 30, 54, 78, 102, 126, 150],
      [6, 24, 50, 76, 102, 128, 154],
      [6, 28, 54, 80, 106, 132, 158],
      [6, 32, 58, 84, 110, 136, 162],
      [6, 26, 54, 82, 110, 138, 166],
      [6, 30, 58, 86, 114, 142, 170]
    ],

    G15: (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),
    G18: (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),
    G15_MASK: (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1),

    /*
     BCH编码格式信息
     */
    getBCHTypeInfo: function(data) {
      var d = data << 10;
      while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
        d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15)));
      }
      return ((data << 10) | d) ^ QRUtil.G15_MASK;
    },
    /*
     BCH编码版本信息
     */
    getBCHTypeNumber: function(data) {
      var d = data << 12;
      while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
        d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18)));
      }
      return (data << 12) | d;
    },
    /*
     获取BCH位信息
     */
    getBCHDigit: function(data) {

      var digit = 0;

      while (data != 0) {
        digit++;
        data >>>= 1;
      }

      return digit;
    },
    /*
     获取版本对应的矫正图形位置
     */
    getPatternPosition: function(typeNumber) {
      return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
    },
    /*
     掩膜算法
     */
    getMask: function(maskPattern, i, j) {

      switch (maskPattern) {

        case QRMaskPattern.PATTERN000:
          return (i + j) % 2 == 0;
        case QRMaskPattern.PATTERN001:
          return i % 2 == 0;
        case QRMaskPattern.PATTERN010:
          return j % 3 == 0;
        case QRMaskPattern.PATTERN011:
          return (i + j) % 3 == 0;
        case QRMaskPattern.PATTERN100:
          return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
        case QRMaskPattern.PATTERN101:
          return (i * j) % 2 + (i * j) % 3 == 0;
        case QRMaskPattern.PATTERN110:
          return ((i * j) % 2 + (i * j) % 3) % 2 == 0;
        case QRMaskPattern.PATTERN111:
          return ((i * j) % 3 + (i + j) % 2) % 2 == 0;

        default:
          throw new Error("bad maskPattern:" + maskPattern);
      }
    },
    /*
     获取RS的纠错多项式
     */
    getErrorCorrectPolynomial: function(errorCorrectLength) {

      var a = new QRPolynomial([1], 0);

      for (var i = 0; i < errorCorrectLength; i++) {
        a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0));
      }

      return a;
    },
    /*
     获取评价
     */
    getLostPoint: function(qrCode) {

      var moduleCount = qrCode.getModuleCount(),
          lostPoint = 0,
          darkCount = 0;

      for (var row = 0; row < moduleCount; row++) {

        var sameCount = 0;
        var head = qrCode.modules[row][0];

        for (var col = 0; col < moduleCount; col++) {

          var current = qrCode.modules[row][col];

          //level 3 评价
          if (col < moduleCount - 6) {
            if (current && !qrCode.modules[row][ col + 1] && qrCode.modules[row][ col + 2] && qrCode.modules[row][ col + 3] && qrCode.modules[row][ col + 4] && !qrCode.modules[row][ col + 5] && qrCode.modules[row][ col + 6]) {
              if (col < moduleCount - 10) {
                if (qrCode.modules[row][ col + 7] && qrCode.modules[row][ col + 8] && qrCode.modules[row][ col + 9] && qrCode.modules[row][ col + 10]) {
                  lostPoint += 40;
                }
              } else if (col > 3) {
                if (qrCode.modules[row][ col - 1] && qrCode.modules[row][ col - 2] && qrCode.modules[row][ col - 3] && qrCode.modules[row][ col - 4]) {
                  lostPoint += 40;
                }
              }

            }
          }

          //level 2 评价
          if ((row < moduleCount - 1) && (col < moduleCount - 1)) {
            var count = 0;
            if (current) count++;
            if (qrCode.modules[row + 1][ col]) count++;
            if (qrCode.modules[row][ col + 1]) count++;
            if (qrCode.modules[row + 1][ col + 1]) count++;
            if (count == 0 || count == 4) {
              lostPoint += 3;
            }
          }

          //level 1 评价
          if (head ^ current) {
            sameCount++;
          } else {
            head = current;
            if (sameCount >= 5) {
              lostPoint += (3 + sameCount - 5);
            }
            sameCount = 1;
          }

          //level 4 评价
          if (current) {
            darkCount++;
          }

        }
      }

      for (var col = 0; col < moduleCount; col++) {

        var sameCount = 0;
        var head = qrCode.modules[0][col];

        for (var row = 0; row < moduleCount; row++) {

          var current = qrCode.modules[row][col];

          //level 3 评价
          if (row < moduleCount - 6) {
            if (current && !qrCode.modules[row + 1][ col] && qrCode.modules[row + 2][ col] && qrCode.modules[row + 3][ col] && qrCode.modules[row + 4][ col] && !qrCode.modules[row + 5][ col] && qrCode.modules[row + 6][ col]) {
              if (row < moduleCount - 10) {
                if (qrCode.modules[row + 7][ col] && qrCode.modules[row + 8][ col] && qrCode.modules[row + 9][ col] && qrCode.modules[row + 10][ col]) {
                  lostPoint += 40;
                }
              } else if (row > 3) {
                if (qrCode.modules[row - 1][ col] && qrCode.modules[row - 2][ col] && qrCode.modules[row - 3][ col] && qrCode.modules[row - 4][ col]) {
                  lostPoint += 40;
                }
              }
            }
          }

          //level 1 评价
          if (head ^ current) {
            sameCount++;
          } else {
            head = current;
            if (sameCount >= 5) {
              lostPoint += (3 + sameCount - 5);
            }
            sameCount = 1;
          }

        }
      }

      // LEVEL4

      var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
      lostPoint += ratio * 10;

      return lostPoint;
    }

  };


//---------------------------------------------------------------------
// QRMath使用的数学工具
//---------------------------------------------------------------------

  var QRMath = {
    /*
     将n转化为a^m
     */
    glog: function(n) {

      if (n < 1) {
        throw new Error("glog(" + n + ")");
      }

      return QRMath.LOG_TABLE[n];
    },
    /*
     将a^m转化为n
     */
    gexp: function(n) {

      while (n < 0) {
        n += 255;
      }

      while (n >= 256) {
        n -= 255;
      }

      return QRMath.EXP_TABLE[n];
    },

    EXP_TABLE: new Array(256),

    LOG_TABLE: new Array(256)

  };

  for (var i = 0; i < 8; i++) {
    QRMath.EXP_TABLE[i] = 1 << i;
  }
  for (var i = 8; i < 256; i++) {
    QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4] ^ QRMath.EXP_TABLE[i - 5] ^ QRMath.EXP_TABLE[i - 6] ^ QRMath.EXP_TABLE[i - 8];
  }
  for (var i = 0; i < 255; i++) {
    QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i;
  }

//---------------------------------------------------------------------
// QRPolynomial 多项式
//---------------------------------------------------------------------
  /**
   * 多项式类
   * @param {Array} num   系数
   * @param {num} shift a^shift
   */
  function QRPolynomial(num, shift) {

    if (num.length == undefined) {
      throw new Error(num.length + "/" + shift);
    }

    var offset = 0;

    while (offset < num.length && num[offset] == 0) {
      offset++;
    }

    this.num = new Array(num.length - offset + shift);
    for (var i = 0; i < num.length - offset; i++) {
      this.num[i] = num[i + offset];
    }
  }

  QRPolynomial.prototype = {

    get: function(index) {
      return this.num[index];
    },

    getLength: function() {
      return this.num.length;
    },
    /**
     * 多项式乘法
     * @param  {QRPolynomial} e 被乘多项式
     * @return {[type]}   [description]
     */
    multiply: function(e) {

      var num = new Array(this.getLength() + e.getLength() - 1);

      for (var i = 0; i < this.getLength(); i++) {
        for (var j = 0; j < e.getLength(); j++) {
          num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i)) + QRMath.glog(e.get(j)));
        }
      }

      return new QRPolynomial(num, 0);
    },
    /**
     * 多项式模运算
     * @param  {QRPolynomial} e 模多项式
     * @return {}
     */
    mod: function(e) {
      var tl = this.getLength(),
          el = e.getLength();
      if (tl - el < 0) {
        return this;
      }
      var num = new Array(tl);
      for (var i = 0; i < tl; i++) {
        num[i] = this.get(i);
      }
      while (num.length >= el) {
        var ratio = QRMath.glog(num[0]) - QRMath.glog(e.get(0));

        for (var i = 0; i < e.getLength(); i++) {
          num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio);
        }
        while (num[0] == 0) {
          num.shift();
        }
      }
      return new QRPolynomial(num, 0);
    }
  };

//---------------------------------------------------------------------
// RS_BLOCK_TABLE
//---------------------------------------------------------------------
  /*
   二维码各个版本信息[块数, 每块中的数据块数, 每块中的信息块数]
   */
  var RS_BLOCK_TABLE = [

// L
// M
// Q
// H

// 1
    [1, 26, 19],
    [1, 26, 16],
    [1, 26, 13],
    [1, 26, 9],

    // 2
    [1, 44, 34],
    [1, 44, 28],
    [1, 44, 22],
    [1, 44, 16],

    // 3
    [1, 70, 55],
    [1, 70, 44],
    [2, 35, 17],
    [2, 35, 13],

    // 4
    [1, 100, 80],
    [2, 50, 32],
    [2, 50, 24],
    [4, 25, 9],

    // 5
    [1, 134, 108],
    [2, 67, 43],
    [2, 33, 15, 2, 34, 16],
    [2, 33, 11, 2, 34, 12],

    // 6
    [2, 86, 68],
    [4, 43, 27],
    [4, 43, 19],
    [4, 43, 15],

    // 7
    [2, 98, 78],
    [4, 49, 31],
    [2, 32, 14, 4, 33, 15],
    [4, 39, 13, 1, 40, 14],

    // 8
    [2, 121, 97],
    [2, 60, 38, 2, 61, 39],
    [4, 40, 18, 2, 41, 19],
    [4, 40, 14, 2, 41, 15],

    // 9
    [2, 146, 116],
    [3, 58, 36, 2, 59, 37],
    [4, 36, 16, 4, 37, 17],
    [4, 36, 12, 4, 37, 13],

    // 10
    [2, 86, 68, 2, 87, 69],
    [4, 69, 43, 1, 70, 44],
    [6, 43, 19, 2, 44, 20],
    [6, 43, 15, 2, 44, 16],

    // 11
    [4, 101, 81],
    [1, 80, 50, 4, 81, 51],
    [4, 50, 22, 4, 51, 23],
    [3, 36, 12, 8, 37, 13],

    // 12
    [2, 116, 92, 2, 117, 93],
    [6, 58, 36, 2, 59, 37],
    [4, 46, 20, 6, 47, 21],
    [7, 42, 14, 4, 43, 15],

    // 13
    [4, 133, 107],
    [8, 59, 37, 1, 60, 38],
    [8, 44, 20, 4, 45, 21],
    [12, 33, 11, 4, 34, 12],

    // 14
    [3, 145, 115, 1, 146, 116],
    [4, 64, 40, 5, 65, 41],
    [11, 36, 16, 5, 37, 17],
    [11, 36, 12, 5, 37, 13],

    // 15
    [5, 109, 87, 1, 110, 88],
    [5, 65, 41, 5, 66, 42],
    [5, 54, 24, 7, 55, 25],
    [11, 36, 12],

    // 16
    [5, 122, 98, 1, 123, 99],
    [7, 73, 45, 3, 74, 46],
    [15, 43, 19, 2, 44, 20],
    [3, 45, 15, 13, 46, 16],

    // 17
    [1, 135, 107, 5, 136, 108],
    [10, 74, 46, 1, 75, 47],
    [1, 50, 22, 15, 51, 23],
    [2, 42, 14, 17, 43, 15],

    // 18
    [5, 150, 120, 1, 151, 121],
    [9, 69, 43, 4, 70, 44],
    [17, 50, 22, 1, 51, 23],
    [2, 42, 14, 19, 43, 15],

    // 19
    [3, 141, 113, 4, 142, 114],
    [3, 70, 44, 11, 71, 45],
    [17, 47, 21, 4, 48, 22],
    [9, 39, 13, 16, 40, 14],

    // 20
    [3, 135, 107, 5, 136, 108],
    [3, 67, 41, 13, 68, 42],
    [15, 54, 24, 5, 55, 25],
    [15, 43, 15, 10, 44, 16],

    // 21
    [4, 144, 116, 4, 145, 117],
    [17, 68, 42],
    [17, 50, 22, 6, 51, 23],
    [19, 46, 16, 6, 47, 17],

    // 22
    [2, 139, 111, 7, 140, 112],
    [17, 74, 46],
    [7, 54, 24, 16, 55, 25],
    [34, 37, 13],

    // 23
    [4, 151, 121, 5, 152, 122],
    [4, 75, 47, 14, 76, 48],
    [11, 54, 24, 14, 55, 25],
    [16, 45, 15, 14, 46, 16],

    // 24
    [6, 147, 117, 4, 148, 118],
    [6, 73, 45, 14, 74, 46],
    [11, 54, 24, 16, 55, 25],
    [30, 46, 16, 2, 47, 17],

    // 25
    [8, 132, 106, 4, 133, 107],
    [8, 75, 47, 13, 76, 48],
    [7, 54, 24, 22, 55, 25],
    [22, 45, 15, 13, 46, 16],

    // 26
    [10, 142, 114, 2, 143, 115],
    [19, 74, 46, 4, 75, 47],
    [28, 50, 22, 6, 51, 23],
    [33, 46, 16, 4, 47, 17],

    // 27
    [8, 152, 122, 4, 153, 123],
    [22, 73, 45, 3, 74, 46],
    [8, 53, 23, 26, 54, 24],
    [12, 45, 15, 28, 46, 16],

    // 28
    [3, 147, 117, 10, 148, 118],
    [3, 73, 45, 23, 74, 46],
    [4, 54, 24, 31, 55, 25],
    [11, 45, 15, 31, 46, 16],

    // 29
    [7, 146, 116, 7, 147, 117],
    [21, 73, 45, 7, 74, 46],
    [1, 53, 23, 37, 54, 24],
    [19, 45, 15, 26, 46, 16],

    // 30
    [5, 145, 115, 10, 146, 116],
    [19, 75, 47, 10, 76, 48],
    [15, 54, 24, 25, 55, 25],
    [23, 45, 15, 25, 46, 16],

    // 31
    [13, 145, 115, 3, 146, 116],
    [2, 74, 46, 29, 75, 47],
    [42, 54, 24, 1, 55, 25],
    [23, 45, 15, 28, 46, 16],

    // 32
    [17, 145, 115],
    [10, 74, 46, 23, 75, 47],
    [10, 54, 24, 35, 55, 25],
    [19, 45, 15, 35, 46, 16],

    // 33
    [17, 145, 115, 1, 146, 116],
    [14, 74, 46, 21, 75, 47],
    [29, 54, 24, 19, 55, 25],
    [11, 45, 15, 46, 46, 16],

    // 34
    [13, 145, 115, 6, 146, 116],
    [14, 74, 46, 23, 75, 47],
    [44, 54, 24, 7, 55, 25],
    [59, 46, 16, 1, 47, 17],

    // 35
    [12, 151, 121, 7, 152, 122],
    [12, 75, 47, 26, 76, 48],
    [39, 54, 24, 14, 55, 25],
    [22, 45, 15, 41, 46, 16],

    // 36
    [6, 151, 121, 14, 152, 122],
    [6, 75, 47, 34, 76, 48],
    [46, 54, 24, 10, 55, 25],
    [2, 45, 15, 64, 46, 16],

    // 37
    [17, 152, 122, 4, 153, 123],
    [29, 74, 46, 14, 75, 47],
    [49, 54, 24, 10, 55, 25],
    [24, 45, 15, 46, 46, 16],

    // 38
    [4, 152, 122, 18, 153, 123],
    [13, 74, 46, 32, 75, 47],
    [48, 54, 24, 14, 55, 25],
    [42, 45, 15, 32, 46, 16],

    // 39
    [20, 147, 117, 4, 148, 118],
    [40, 75, 47, 7, 76, 48],
    [43, 54, 24, 22, 55, 25],
    [10, 45, 15, 67, 46, 16],

    // 40
    [19, 148, 118, 6, 149, 119],
    [18, 75, 47, 31, 76, 48],
    [34, 54, 24, 34, 55, 25],
    [20, 45, 15, 61, 46, 16]
  ];

  /**
   * 根据数据获取对应版本
   * @return {[type]} [description]
   */
  QRCodeAlg.prototype.getRightType = function() {
    for (var typeNumber = 1; typeNumber < 41; typeNumber++) {
      var rsBlock = RS_BLOCK_TABLE[(typeNumber - 1) * 4 + this.errorCorrectLevel];
      if (rsBlock == undefined) {
        throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + this.errorCorrectLevel);
      }
      var length = rsBlock.length / 3;
      var totalDataCount = 0;
      for (var i = 0; i < length; i++) {
        var count = rsBlock[i * 3 + 0];
        var dataCount = rsBlock[i * 3 + 2];
        totalDataCount += dataCount * count;
      }

      var lengthBytes = typeNumber > 9 ? 2 : 1;
      if (this.utf8bytes.length + lengthBytes < totalDataCount || typeNumber == 40) {
        this.typeNumber = typeNumber;
        this.rsBlock = rsBlock;
        this.totalDataCount = totalDataCount;
        break;
      }
    }
  };

//---------------------------------------------------------------------
// QRBitBuffer
//---------------------------------------------------------------------

  function QRBitBuffer() {
    this.buffer = new Array();
    this.length = 0;
  }

  QRBitBuffer.prototype = {

    get: function(index) {
      var bufIndex = Math.floor(index / 8);
      return ((this.buffer[bufIndex] >>> (7 - index % 8)) & 1);
    },

    put: function(num, length) {
      for (var i = 0; i < length; i++) {
        this.putBit(((num >>> (length - i - 1)) & 1));
      }
    },

    putBit: function(bit) {

      var bufIndex = Math.floor(this.length / 8);
      if (this.buffer.length <= bufIndex) {
        this.buffer.push(0);
      }

      if (bit) {
        this.buffer[bufIndex] |= (0x80 >>> (this.length % 8));
      }

      this.length++;
    }
  };
  /**
   * 获取单个字符的utf8编码
   * unicode BMP平面约65535个字符
   * @param {num} code
   * return {array}
   */
  function unicodeFormat8(code) {
    // 1 byte
    if (code < 128) {
      return [code];
      // 2 bytes
    } else if (code < 2048) {
      c0 = 192 + (code >> 6);
      c1 = 128 + (code & 63);
      return [c0, c1];
      // 3 bytes
    } else {
      c0 = 224 + (code >> 12);
      c1 = 128 + (code >> 6 & 63);
      c2 = 128 + (code & 63);
      return [c0, c1, c2];
    }
  }

  /**
   * 获取字符串的utf8编码字节串
   * @param {string} string
   * @return {array}
   */
  function getUTF8Bytes(string) {
    var utf8codes = [];
    for (var i = 0; i < string.length; i++) {
      var code = string.charCodeAt(i);
      var utf8 = unicodeFormat8(code);
      for (var j = 0; j < utf8.length; j++) {
        utf8codes.push(utf8[j]);
      }
    }
    return utf8codes;
  }

  /**
   * 二维码算法实现
   * @param {string} data              要编码的信息字符串
   * @param {num} errorCorrectLevel 纠错等级
   */
  function QRCodeAlg(data, errorCorrectLevel) {
    this.typeNumber = -1; //版本
    this.errorCorrectLevel = errorCorrectLevel;
    this.modules = null;  //二维矩阵，存放最终结果
    this.moduleCount = 0; //矩阵大小
    this.dataCache = null; //数据缓存
    this.rsBlocks = null; //版本数据信息
    this.totalDataCount = -1; //可使用的数据量
    this.data = data;
    this.utf8bytes = getUTF8Bytes(data);
    this.make();
  }

  QRCodeAlg.prototype = {
    constructor: QRCodeAlg,
    /**
     * 获取二维码矩阵大小
     * @return {num} 矩阵大小
     */
    getModuleCount: function() {
      return this.moduleCount;
    },
    /**
     * 编码
     */
    make: function() {
      this.getRightType();
      this.dataCache = this.createData();
      this.createQrcode();
    },
    /**
     * 设置二位矩阵功能图形
     * @param  {bool} test 表示是否在寻找最好掩膜阶段
     * @param  {num} maskPattern 掩膜的版本
     */
    makeImpl: function(maskPattern) {

      this.moduleCount = this.typeNumber * 4 + 17;
      this.modules = new Array(this.moduleCount);

      for (var row = 0; row < this.moduleCount; row++) {

        this.modules[row] = new Array(this.moduleCount);

      }
      this.setupPositionProbePattern(0, 0);
      this.setupPositionProbePattern(this.moduleCount - 7, 0);
      this.setupPositionProbePattern(0, this.moduleCount - 7);
      this.setupPositionAdjustPattern();
      this.setupTimingPattern();
      this.setupTypeInfo(true, maskPattern);

      if (this.typeNumber >= 7) {
        this.setupTypeNumber(true);
      }
      this.mapData(this.dataCache, maskPattern);
    },
    /**
     * 设置二维码的位置探测图形
     * @param  {num} row 探测图形的中心横坐标
     * @param  {num} col 探测图形的中心纵坐标
     */
    setupPositionProbePattern: function(row, col) {

      for (var r = -1; r <= 7; r++) {

        if (row + r <= -1 || this.moduleCount <= row + r) continue;

        for (var c = -1; c <= 7; c++) {

          if (col + c <= -1 || this.moduleCount <= col + c) continue;

          if ((0 <= r && r <= 6 && (c == 0 || c == 6)) || (0 <= c && c <= 6 && (r == 0 || r == 6)) || (2 <= r && r <= 4 && 2 <= c && c <= 4)) {
            this.modules[row + r][col + c] = true;
          } else {
            this.modules[row + r][col + c] = false;
          }
        }
      }
    },
    /**
     * 创建二维码
     * @return {[type]} [description]
     */
    createQrcode: function() {

      var minLostPoint = 0;
      var pattern = 0;
      var bestModules = null;

      for (var i = 0; i < 8; i++) {

        this.makeImpl(i);

        var lostPoint = QRUtil.getLostPoint(this);
        if (i == 0 || minLostPoint > lostPoint) {
          minLostPoint = lostPoint;
          pattern = i;
          bestModules = this.modules;
        }
      }
      this.modules = bestModules;
      this.setupTypeInfo(false, pattern);

      if (this.typeNumber >= 7) {
        this.setupTypeNumber(false);
      }

    },
    /**
     * 设置定位图形
     * @return {[type]} [description]
     */
    setupTimingPattern: function() {

      for (var r = 8; r < this.moduleCount - 8; r++) {
        if (this.modules[r][6] != null) {
          continue;
        }
        this.modules[r][6] = (r % 2 == 0);

        if (this.modules[6][r] != null) {
          continue;
        }
        this.modules[6][r] = (r % 2 == 0);
      }
    },
    /**
     * 设置矫正图形
     * @return {[type]} [description]
     */
    setupPositionAdjustPattern: function() {

      var pos = QRUtil.getPatternPosition(this.typeNumber);

      for (var i = 0; i < pos.length; i++) {

        for (var j = 0; j < pos.length; j++) {

          var row = pos[i];
          var col = pos[j];

          if (this.modules[row][col] != null) {
            continue;
          }

          for (var r = -2; r <= 2; r++) {

            for (var c = -2; c <= 2; c++) {

              if (r == -2 || r == 2 || c == -2 || c == 2 || (r == 0 && c == 0)) {
                this.modules[row + r][col + c] = true;
              } else {
                this.modules[row + r][col + c] = false;
              }
            }
          }
        }
      }
    },
    /**
     * 设置版本信息（7以上版本才有）
     * @param  {bool} test 是否处于判断最佳掩膜阶段
     * @return {[type]}      [description]
     */
    setupTypeNumber: function(test) {

      var bits = QRUtil.getBCHTypeNumber(this.typeNumber);

      for (var i = 0; i < 18; i++) {
        var mod = (!test && ((bits >> i) & 1) == 1);
        this.modules[Math.floor(i / 3)][i % 3 + this.moduleCount - 8 - 3] = mod;
        this.modules[i % 3 + this.moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
      }
    },
    /**
     * 设置格式信息（纠错等级和掩膜版本）
     * @param  {bool} test
     * @param  {num} maskPattern 掩膜版本
     * @return {}
     */
    setupTypeInfo: function(test, maskPattern) {

      var data = (QRErrorCorrectLevel[this.errorCorrectLevel] << 3) | maskPattern;
      var bits = QRUtil.getBCHTypeInfo(data);

      // vertical
      for (var i = 0; i < 15; i++) {

        var mod = (!test && ((bits >> i) & 1) == 1);

        if (i < 6) {
          this.modules[i][8] = mod;
        } else if (i < 8) {
          this.modules[i + 1][8] = mod;
        } else {
          this.modules[this.moduleCount - 15 + i][8] = mod;
        }

        // horizontal
        var mod = (!test && ((bits >> i) & 1) == 1);

        if (i < 8) {
          this.modules[8][this.moduleCount - i - 1] = mod;
        } else if (i < 9) {
          this.modules[8][15 - i - 1 + 1] = mod;
        } else {
          this.modules[8][15 - i - 1] = mod;
        }
      }

      // fixed module
      this.modules[this.moduleCount - 8][8] = (!test);

    },
    /**
     * 数据编码
     * @return {[type]} [description]
     */
    createData: function() {
      var buffer = new QRBitBuffer();
      var lengthBits = this.typeNumber > 9 ? 16 : 8;
      buffer.put(4, 4); //添加模式
      buffer.put(this.utf8bytes.length, lengthBits);
      for (var i = 0, l = this.utf8bytes.length; i < l; i++) {
        buffer.put(this.utf8bytes[i], 8);
      }
      if (buffer.length + 4 <= this.totalDataCount * 8) {
        buffer.put(0, 4);
      }

      // padding
      while (buffer.length % 8 != 0) {
        buffer.putBit(false);
      }

      // padding
      while (true) {

        if (buffer.length >= this.totalDataCount * 8) {
          break;
        }
        buffer.put(QRCodeAlg.PAD0, 8);

        if (buffer.length >= this.totalDataCount * 8) {
          break;
        }
        buffer.put(QRCodeAlg.PAD1, 8);
      }
      return this.createBytes(buffer);
    },
    /**
     * 纠错码编码
     * @param  {buffer} buffer 数据编码
     * @return {[type]}
     */
    createBytes: function(buffer) {

      var offset = 0;

      var maxDcCount = 0;
      var maxEcCount = 0;

      var length = this.rsBlock.length / 3;

      var rsBlocks = new Array();

      for (var i = 0; i < length; i++) {

        var count = this.rsBlock[i * 3 + 0];
        var totalCount = this.rsBlock[i * 3 + 1];
        var dataCount = this.rsBlock[i * 3 + 2];

        for (var j = 0; j < count; j++) {
          rsBlocks.push([dataCount, totalCount]);
        }
      }

      var dcdata = new Array(rsBlocks.length);
      var ecdata = new Array(rsBlocks.length);

      for (var r = 0; r < rsBlocks.length; r++) {

        var dcCount = rsBlocks[r][0];
        var ecCount = rsBlocks[r][1] - dcCount;

        maxDcCount = Math.max(maxDcCount, dcCount);
        maxEcCount = Math.max(maxEcCount, ecCount);

        dcdata[r] = new Array(dcCount);

        for (var i = 0; i < dcdata[r].length; i++) {
          dcdata[r][i] = 0xff & buffer.buffer[i + offset];
        }
        offset += dcCount;

        var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
        var rawPoly = new QRPolynomial(dcdata[r], rsPoly.getLength() - 1);

        var modPoly = rawPoly.mod(rsPoly);
        ecdata[r] = new Array(rsPoly.getLength() - 1);
        for (var i = 0; i < ecdata[r].length; i++) {
          var modIndex = i + modPoly.getLength() - ecdata[r].length;
          ecdata[r][i] = (modIndex >= 0) ? modPoly.get(modIndex) : 0;
        }
      }

      var data = new Array(this.totalDataCount);
      var index = 0;

      for (var i = 0; i < maxDcCount; i++) {
        for (var r = 0; r < rsBlocks.length; r++) {
          if (i < dcdata[r].length) {
            data[index++] = dcdata[r][i];
          }
        }
      }

      for (var i = 0; i < maxEcCount; i++) {
        for (var r = 0; r < rsBlocks.length; r++) {
          if (i < ecdata[r].length) {
            data[index++] = ecdata[r][i];
          }
        }
      }

      return data;

    },
    /**
     * 布置模块，构建最终信息
     * @param  {} data
     * @param  {} maskPattern
     * @return {}
     */
    mapData: function(data, maskPattern) {

      var inc = -1;
      var row = this.moduleCount - 1;
      var bitIndex = 7;
      var byteIndex = 0;

      for (var col = this.moduleCount - 1; col > 0; col -= 2) {

        if (col == 6) col--;

        while (true) {

          for (var c = 0; c < 2; c++) {

            if (this.modules[row][col - c] == null) {

              var dark = false;

              if (byteIndex < data.length) {
                dark = (((data[byteIndex] >>> bitIndex) & 1) == 1);
              }

              var mask = QRUtil.getMask(maskPattern, row, col - c);

              if (mask) {
                dark = !dark;
              }

              this.modules[row][col - c] = dark;
              bitIndex--;

              if (bitIndex == -1) {
                byteIndex++;
                bitIndex = 7;
              }
            }
          }

          row += inc;

          if (row < 0 || this.moduleCount <= row) {
            row -= inc;
            inc = -inc;
            break;
          }
        }
      }
    }

  };
  /**
   * 填充字段
   */
  QRCodeAlg.PAD0 = 0xEC;
  QRCodeAlg.PAD1 = 0x11;


//---------------------------------------------------------------------
// 纠错等级对应的编码
//---------------------------------------------------------------------

  var QRErrorCorrectLevel = [1, 0, 3, 2];

//---------------------------------------------------------------------
// 掩膜版本
//---------------------------------------------------------------------

  var QRMaskPattern = {
    PATTERN000: 0,
    PATTERN001: 1,
    PATTERN010: 2,
    PATTERN011: 3,
    PATTERN100: 4,
    PATTERN101: 5,
    PATTERN110: 6,
    PATTERN111: 7
  };

//---------------------------------------------------------------------
// 工具类
//---------------------------------------------------------------------

  var QRUtil = {

    /*
     每个版本矫正图形的位置
     */
    PATTERN_POSITION_TABLE: [
      [],
      [6, 18],
      [6, 22],
      [6, 26],
      [6, 30],
      [6, 34],
      [6, 22, 38],
      [6, 24, 42],
      [6, 26, 46],
      [6, 28, 50],
      [6, 30, 54],
      [6, 32, 58],
      [6, 34, 62],
      [6, 26, 46, 66],
      [6, 26, 48, 70],
      [6, 26, 50, 74],
      [6, 30, 54, 78],
      [6, 30, 56, 82],
      [6, 30, 58, 86],
      [6, 34, 62, 90],
      [6, 28, 50, 72, 94],
      [6, 26, 50, 74, 98],
      [6, 30, 54, 78, 102],
      [6, 28, 54, 80, 106],
      [6, 32, 58, 84, 110],
      [6, 30, 58, 86, 114],
      [6, 34, 62, 90, 118],
      [6, 26, 50, 74, 98, 122],
      [6, 30, 54, 78, 102, 126],
      [6, 26, 52, 78, 104, 130],
      [6, 30, 56, 82, 108, 134],
      [6, 34, 60, 86, 112, 138],
      [6, 30, 58, 86, 114, 142],
      [6, 34, 62, 90, 118, 146],
      [6, 30, 54, 78, 102, 126, 150],
      [6, 24, 50, 76, 102, 128, 154],
      [6, 28, 54, 80, 106, 132, 158],
      [6, 32, 58, 84, 110, 136, 162],
      [6, 26, 54, 82, 110, 138, 166],
      [6, 30, 58, 86, 114, 142, 170]
    ],

    G15: (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0),
    G18: (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0),
    G15_MASK: (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1),

    /*
     BCH编码格式信息
     */
    getBCHTypeInfo: function(data) {
      var d = data << 10;
      while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15) >= 0) {
        d ^= (QRUtil.G15 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G15)));
      }
      return ((data << 10) | d) ^ QRUtil.G15_MASK;
    },
    /*
     BCH编码版本信息
     */
    getBCHTypeNumber: function(data) {
      var d = data << 12;
      while (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18) >= 0) {
        d ^= (QRUtil.G18 << (QRUtil.getBCHDigit(d) - QRUtil.getBCHDigit(QRUtil.G18)));
      }
      return (data << 12) | d;
    },
    /*
     获取BCH位信息
     */
    getBCHDigit: function(data) {

      var digit = 0;

      while (data != 0) {
        digit++;
        data >>>= 1;
      }

      return digit;
    },
    /*
     获取版本对应的矫正图形位置
     */
    getPatternPosition: function(typeNumber) {
      return QRUtil.PATTERN_POSITION_TABLE[typeNumber - 1];
    },
    /*
     掩膜算法
     */
    getMask: function(maskPattern, i, j) {

      switch (maskPattern) {

        case QRMaskPattern.PATTERN000:
          return (i + j) % 2 == 0;
        case QRMaskPattern.PATTERN001:
          return i % 2 == 0;
        case QRMaskPattern.PATTERN010:
          return j % 3 == 0;
        case QRMaskPattern.PATTERN011:
          return (i + j) % 3 == 0;
        case QRMaskPattern.PATTERN100:
          return (Math.floor(i / 2) + Math.floor(j / 3)) % 2 == 0;
        case QRMaskPattern.PATTERN101:
          return (i * j) % 2 + (i * j) % 3 == 0;
        case QRMaskPattern.PATTERN110:
          return ((i * j) % 2 + (i * j) % 3) % 2 == 0;
        case QRMaskPattern.PATTERN111:
          return ((i * j) % 3 + (i + j) % 2) % 2 == 0;

        default:
          throw new Error("bad maskPattern:" + maskPattern);
      }
    },
    /*
     获取RS的纠错多项式
     */
    getErrorCorrectPolynomial: function(errorCorrectLength) {

      var a = new QRPolynomial([1], 0);

      for (var i = 0; i < errorCorrectLength; i++) {
        a = a.multiply(new QRPolynomial([1, QRMath.gexp(i)], 0));
      }

      return a;
    },
    /*
     获取评价
     */
    getLostPoint: function(qrCode) {

      var moduleCount = qrCode.getModuleCount(),
          lostPoint = 0,
          darkCount = 0;

      for (var row = 0; row < moduleCount; row++) {

        var sameCount = 0;
        var head = qrCode.modules[row][0];

        for (var col = 0; col < moduleCount; col++) {

          var current = qrCode.modules[row][col];

          //level 3 评价
          if (col < moduleCount - 6) {
            if (current && !qrCode.modules[row][ col + 1] && qrCode.modules[row][ col + 2] && qrCode.modules[row][ col + 3] && qrCode.modules[row][ col + 4] && !qrCode.modules[row][ col + 5] && qrCode.modules[row][ col + 6]) {
              if (col < moduleCount - 10) {
                if (qrCode.modules[row][ col + 7] && qrCode.modules[row][ col + 8] && qrCode.modules[row][ col + 9] && qrCode.modules[row][ col + 10]) {
                  lostPoint += 40;
                }
              } else if (col > 3) {
                if (qrCode.modules[row][ col - 1] && qrCode.modules[row][ col - 2] && qrCode.modules[row][ col - 3] && qrCode.modules[row][ col - 4]) {
                  lostPoint += 40;
                }
              }

            }
          }

          //level 2 评价
          if ((row < moduleCount - 1) && (col < moduleCount - 1)) {
            var count = 0;
            if (current) count++;
            if (qrCode.modules[row + 1][ col]) count++;
            if (qrCode.modules[row][ col + 1]) count++;
            if (qrCode.modules[row + 1][ col + 1]) count++;
            if (count == 0 || count == 4) {
              lostPoint += 3;
            }
          }

          //level 1 评价
          if (head ^ current) {
            sameCount++;
          } else {
            head = current;
            if (sameCount >= 5) {
              lostPoint += (3 + sameCount - 5);
            }
            sameCount = 1;
          }

          //level 4 评价
          if (current) {
            darkCount++;
          }

        }
      }

      for (var col = 0; col < moduleCount; col++) {

        var sameCount = 0;
        var head = qrCode.modules[0][col];

        for (var row = 0; row < moduleCount; row++) {

          var current = qrCode.modules[row][col];

          //level 3 评价
          if (row < moduleCount - 6) {
            if (current && !qrCode.modules[row + 1][ col] && qrCode.modules[row + 2][ col] && qrCode.modules[row + 3][ col] && qrCode.modules[row + 4][ col] && !qrCode.modules[row + 5][ col] && qrCode.modules[row + 6][ col]) {
              if (row < moduleCount - 10) {
                if (qrCode.modules[row + 7][ col] && qrCode.modules[row + 8][ col] && qrCode.modules[row + 9][ col] && qrCode.modules[row + 10][ col]) {
                  lostPoint += 40;
                }
              } else if (row > 3) {
                if (qrCode.modules[row - 1][ col] && qrCode.modules[row - 2][ col] && qrCode.modules[row - 3][ col] && qrCode.modules[row - 4][ col]) {
                  lostPoint += 40;
                }
              }
            }
          }

          //level 1 评价
          if (head ^ current) {
            sameCount++;
          } else {
            head = current;
            if (sameCount >= 5) {
              lostPoint += (3 + sameCount - 5);
            }
            sameCount = 1;
          }

        }
      }

      // LEVEL4

      var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
      lostPoint += ratio * 10;

      return lostPoint;
    }

  };


//---------------------------------------------------------------------
// QRMath使用的数学工具
//---------------------------------------------------------------------

  var QRMath = {
    /*
     将n转化为a^m
     */
    glog: function(n) {

      if (n < 1) {
        throw new Error("glog(" + n + ")");
      }

      return QRMath.LOG_TABLE[n];
    },
    /*
     将a^m转化为n
     */
    gexp: function(n) {

      while (n < 0) {
        n += 255;
      }

      while (n >= 256) {
        n -= 255;
      }

      return QRMath.EXP_TABLE[n];
    },

    EXP_TABLE: new Array(256),

    LOG_TABLE: new Array(256)

  };

  for (var i = 0; i < 8; i++) {
    QRMath.EXP_TABLE[i] = 1 << i;
  }
  for (var i = 8; i < 256; i++) {
    QRMath.EXP_TABLE[i] = QRMath.EXP_TABLE[i - 4] ^ QRMath.EXP_TABLE[i - 5] ^ QRMath.EXP_TABLE[i - 6] ^ QRMath.EXP_TABLE[i - 8];
  }
  for (var i = 0; i < 255; i++) {
    QRMath.LOG_TABLE[QRMath.EXP_TABLE[i]] = i;
  }

//---------------------------------------------------------------------
// QRPolynomial 多项式
//---------------------------------------------------------------------
  /**
   * 多项式类
   * @param {Array} num   系数
   * @param {num} shift a^shift
   */
  function QRPolynomial(num, shift) {

    if (num.length == undefined) {
      throw new Error(num.length + "/" + shift);
    }

    var offset = 0;

    while (offset < num.length && num[offset] == 0) {
      offset++;
    }

    this.num = new Array(num.length - offset + shift);
    for (var i = 0; i < num.length - offset; i++) {
      this.num[i] = num[i + offset];
    }
  }

  QRPolynomial.prototype = {

    get: function(index) {
      return this.num[index];
    },

    getLength: function() {
      return this.num.length;
    },
    /**
     * 多项式乘法
     * @param  {QRPolynomial} e 被乘多项式
     * @return {[type]}   [description]
     */
    multiply: function(e) {

      var num = new Array(this.getLength() + e.getLength() - 1);

      for (var i = 0; i < this.getLength(); i++) {
        for (var j = 0; j < e.getLength(); j++) {
          num[i + j] ^= QRMath.gexp(QRMath.glog(this.get(i)) + QRMath.glog(e.get(j)));
        }
      }

      return new QRPolynomial(num, 0);
    },
    /**
     * 多项式模运算
     * @param  {QRPolynomial} e 模多项式
     * @return {}
     */
    mod: function(e) {
      var tl = this.getLength(),
          el = e.getLength();
      if (tl - el < 0) {
        return this;
      }
      var num = new Array(tl);
      for (var i = 0; i < tl; i++) {
        num[i] = this.get(i);
      }
      while (num.length >= el) {
        var ratio = QRMath.glog(num[0]) - QRMath.glog(e.get(0));

        for (var i = 0; i < e.getLength(); i++) {
          num[i] ^= QRMath.gexp(QRMath.glog(e.get(i)) + ratio);
        }
        while (num[0] == 0) {
          num.shift();
        }
      }
      return new QRPolynomial(num, 0);
    }
  };

//---------------------------------------------------------------------
// RS_BLOCK_TABLE
//---------------------------------------------------------------------
  /*
   二维码各个版本信息[块数, 每块中的数据块数, 每块中的信息块数]
   */
  RS_BLOCK_TABLE = [

// L
// M
// Q
// H

// 1
    [1, 26, 19],
    [1, 26, 16],
    [1, 26, 13],
    [1, 26, 9],

    // 2
    [1, 44, 34],
    [1, 44, 28],
    [1, 44, 22],
    [1, 44, 16],

    // 3
    [1, 70, 55],
    [1, 70, 44],
    [2, 35, 17],
    [2, 35, 13],

    // 4
    [1, 100, 80],
    [2, 50, 32],
    [2, 50, 24],
    [4, 25, 9],

    // 5
    [1, 134, 108],
    [2, 67, 43],
    [2, 33, 15, 2, 34, 16],
    [2, 33, 11, 2, 34, 12],

    // 6
    [2, 86, 68],
    [4, 43, 27],
    [4, 43, 19],
    [4, 43, 15],

    // 7
    [2, 98, 78],
    [4, 49, 31],
    [2, 32, 14, 4, 33, 15],
    [4, 39, 13, 1, 40, 14],

    // 8
    [2, 121, 97],
    [2, 60, 38, 2, 61, 39],
    [4, 40, 18, 2, 41, 19],
    [4, 40, 14, 2, 41, 15],

    // 9
    [2, 146, 116],
    [3, 58, 36, 2, 59, 37],
    [4, 36, 16, 4, 37, 17],
    [4, 36, 12, 4, 37, 13],

    // 10
    [2, 86, 68, 2, 87, 69],
    [4, 69, 43, 1, 70, 44],
    [6, 43, 19, 2, 44, 20],
    [6, 43, 15, 2, 44, 16],

    // 11
    [4, 101, 81],
    [1, 80, 50, 4, 81, 51],
    [4, 50, 22, 4, 51, 23],
    [3, 36, 12, 8, 37, 13],

    // 12
    [2, 116, 92, 2, 117, 93],
    [6, 58, 36, 2, 59, 37],
    [4, 46, 20, 6, 47, 21],
    [7, 42, 14, 4, 43, 15],

    // 13
    [4, 133, 107],
    [8, 59, 37, 1, 60, 38],
    [8, 44, 20, 4, 45, 21],
    [12, 33, 11, 4, 34, 12],

    // 14
    [3, 145, 115, 1, 146, 116],
    [4, 64, 40, 5, 65, 41],
    [11, 36, 16, 5, 37, 17],
    [11, 36, 12, 5, 37, 13],

    // 15
    [5, 109, 87, 1, 110, 88],
    [5, 65, 41, 5, 66, 42],
    [5, 54, 24, 7, 55, 25],
    [11, 36, 12],

    // 16
    [5, 122, 98, 1, 123, 99],
    [7, 73, 45, 3, 74, 46],
    [15, 43, 19, 2, 44, 20],
    [3, 45, 15, 13, 46, 16],

    // 17
    [1, 135, 107, 5, 136, 108],
    [10, 74, 46, 1, 75, 47],
    [1, 50, 22, 15, 51, 23],
    [2, 42, 14, 17, 43, 15],

    // 18
    [5, 150, 120, 1, 151, 121],
    [9, 69, 43, 4, 70, 44],
    [17, 50, 22, 1, 51, 23],
    [2, 42, 14, 19, 43, 15],

    // 19
    [3, 141, 113, 4, 142, 114],
    [3, 70, 44, 11, 71, 45],
    [17, 47, 21, 4, 48, 22],
    [9, 39, 13, 16, 40, 14],

    // 20
    [3, 135, 107, 5, 136, 108],
    [3, 67, 41, 13, 68, 42],
    [15, 54, 24, 5, 55, 25],
    [15, 43, 15, 10, 44, 16],

    // 21
    [4, 144, 116, 4, 145, 117],
    [17, 68, 42],
    [17, 50, 22, 6, 51, 23],
    [19, 46, 16, 6, 47, 17],

    // 22
    [2, 139, 111, 7, 140, 112],
    [17, 74, 46],
    [7, 54, 24, 16, 55, 25],
    [34, 37, 13],

    // 23
    [4, 151, 121, 5, 152, 122],
    [4, 75, 47, 14, 76, 48],
    [11, 54, 24, 14, 55, 25],
    [16, 45, 15, 14, 46, 16],

    // 24
    [6, 147, 117, 4, 148, 118],
    [6, 73, 45, 14, 74, 46],
    [11, 54, 24, 16, 55, 25],
    [30, 46, 16, 2, 47, 17],

    // 25
    [8, 132, 106, 4, 133, 107],
    [8, 75, 47, 13, 76, 48],
    [7, 54, 24, 22, 55, 25],
    [22, 45, 15, 13, 46, 16],

    // 26
    [10, 142, 114, 2, 143, 115],
    [19, 74, 46, 4, 75, 47],
    [28, 50, 22, 6, 51, 23],
    [33, 46, 16, 4, 47, 17],

    // 27
    [8, 152, 122, 4, 153, 123],
    [22, 73, 45, 3, 74, 46],
    [8, 53, 23, 26, 54, 24],
    [12, 45, 15, 28, 46, 16],

    // 28
    [3, 147, 117, 10, 148, 118],
    [3, 73, 45, 23, 74, 46],
    [4, 54, 24, 31, 55, 25],
    [11, 45, 15, 31, 46, 16],

    // 29
    [7, 146, 116, 7, 147, 117],
    [21, 73, 45, 7, 74, 46],
    [1, 53, 23, 37, 54, 24],
    [19, 45, 15, 26, 46, 16],

    // 30
    [5, 145, 115, 10, 146, 116],
    [19, 75, 47, 10, 76, 48],
    [15, 54, 24, 25, 55, 25],
    [23, 45, 15, 25, 46, 16],

    // 31
    [13, 145, 115, 3, 146, 116],
    [2, 74, 46, 29, 75, 47],
    [42, 54, 24, 1, 55, 25],
    [23, 45, 15, 28, 46, 16],

    // 32
    [17, 145, 115],
    [10, 74, 46, 23, 75, 47],
    [10, 54, 24, 35, 55, 25],
    [19, 45, 15, 35, 46, 16],

    // 33
    [17, 145, 115, 1, 146, 116],
    [14, 74, 46, 21, 75, 47],
    [29, 54, 24, 19, 55, 25],
    [11, 45, 15, 46, 46, 16],

    // 34
    [13, 145, 115, 6, 146, 116],
    [14, 74, 46, 23, 75, 47],
    [44, 54, 24, 7, 55, 25],
    [59, 46, 16, 1, 47, 17],

    // 35
    [12, 151, 121, 7, 152, 122],
    [12, 75, 47, 26, 76, 48],
    [39, 54, 24, 14, 55, 25],
    [22, 45, 15, 41, 46, 16],

    // 36
    [6, 151, 121, 14, 152, 122],
    [6, 75, 47, 34, 76, 48],
    [46, 54, 24, 10, 55, 25],
    [2, 45, 15, 64, 46, 16],

    // 37
    [17, 152, 122, 4, 153, 123],
    [29, 74, 46, 14, 75, 47],
    [49, 54, 24, 10, 55, 25],
    [24, 45, 15, 46, 46, 16],

    // 38
    [4, 152, 122, 18, 153, 123],
    [13, 74, 46, 32, 75, 47],
    [48, 54, 24, 14, 55, 25],
    [42, 45, 15, 32, 46, 16],

    // 39
    [20, 147, 117, 4, 148, 118],
    [40, 75, 47, 7, 76, 48],
    [43, 54, 24, 22, 55, 25],
    [10, 45, 15, 67, 46, 16],

    // 40
    [19, 148, 118, 6, 149, 119],
    [18, 75, 47, 31, 76, 48],
    [34, 54, 24, 34, 55, 25],
    [20, 45, 15, 61, 46, 16]
  ];

  /**
   * 根据数据获取对应版本
   * @return {[type]} [description]
   */
  QRCodeAlg.prototype.getRightType = function() {
    for (var typeNumber = 1; typeNumber < 41; typeNumber++) {
      var rsBlock = RS_BLOCK_TABLE[(typeNumber - 1) * 4 + this.errorCorrectLevel];
      if (rsBlock == undefined) {
        throw new Error("bad rs block @ typeNumber:" + typeNumber + "/errorCorrectLevel:" + this.errorCorrectLevel);
      }
      var length = rsBlock.length / 3;
      var totalDataCount = 0;
      for (var i = 0; i < length; i++) {
        var count = rsBlock[i * 3 + 0];
        var dataCount = rsBlock[i * 3 + 2];
        totalDataCount += dataCount * count;
      }

      var lengthBytes = typeNumber > 9 ? 2 : 1;
      if (this.utf8bytes.length + lengthBytes < totalDataCount || typeNumber == 40) {
        this.typeNumber = typeNumber;
        this.rsBlock = rsBlock;
        this.totalDataCount = totalDataCount;
        break;
      }
    }
  };

//---------------------------------------------------------------------
// QRBitBuffer
//---------------------------------------------------------------------

  function QRBitBuffer() {
    this.buffer = new Array();
    this.length = 0;
  }

  QRBitBuffer.prototype = {

    get: function(index) {
      var bufIndex = Math.floor(index / 8);
      return ((this.buffer[bufIndex] >>> (7 - index % 8)) & 1);
    },

    put: function(num, length) {
      for (var i = 0; i < length; i++) {
        this.putBit(((num >>> (length - i - 1)) & 1));
      }
    },

    putBit: function(bit) {

      var bufIndex = Math.floor(this.length / 8);
      if (this.buffer.length <= bufIndex) {
        this.buffer.push(0);
      }

      if (bit) {
        this.buffer[bufIndex] |= (0x80 >>> (this.length % 8));
      }

      this.length++;
    }
  };

});